Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
PROTECT AND INCREASE
Often you have to handle the fine details of any corrosive liquids, vapours which are harmful to the eyes, and have to work close low, which further increases the risk. Need goggles, but...
LEARN “MORSE CODE”
Did you know that at the time shortwave Amateur radio communication, uniting hundreds of thousands of people in almost all countries of the globe, was to some extent the prototype of the...
